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I'm pretty sure the limitation of road bike braking is the tyres, rather than the brakes.
I'm pretty sure at high speeds that isn't the case.
Pros have their braking points pretty sorted. They are really good at riding their bikes after all. That means unlike us they don't do a lot of feathering the brakes. It's on, or off. Some more power, or the same power using a light dab of one finger is nice. Most of the other issues will eventually be solved.
The only problem with discs is how boring a subject they are on forum threads :-)
I'm pretty sure the limitation of road bike braking is the tyres, rather than the brakes. Though I agree discs are much nicer to use so the 'more certainty' bit is fair.